In our souls we actually possess the predisposition to human love, and to that warmth which understands the other man. In the solid components of our organism, however, we bear moral cold. This is the force which, from the spiritual worlds, welds, as it were, our physical organism together. Thus we bear in ourselves the impulse of hatred. This it is which, from the spiritual world, brings about the circulation of the blood. And whereas we may perhaps go through the world with a very loving soul, with a soul which thirsts for human understanding, we must nevertheless be aware that below in the unconsciousness, there where the soul streams down, sends its impulses down into the bodily nature, for the very purpose that we may be clothed in a body — coldness has its seat.
Though I shall always speak just of coldness, what I mean is moral coldness, though this can certainly pass over into physical coldness, traversing the warmth-ether on its way. There below, in the unconsciousness within us, moral coldness and hatred are entrenched, and it is easy for man to bring into his soul what is present in his body, so that his soul can, as it were, be infected with the lack of human understanding. This is, however, the result of moral coldness and human hatred. Because this is so, man must gradually cultivate in himself moral warmth, that is to say human understanding and love, for these must vanquish what comes from the bodily nature.
Source: Rudolf Steiner – GA 230 – MAN AS SYMPHONY OF THE CREATIVE WORD – Lecture XII – Dornach, 11 November 1923